Addressed bugs

[pull:#91/#90] in certain conditions, the Apply button in the Toolchains tab did not save the page content; fixed.

[pull:#107/#106] in certain conditions, after removing a plug-in implementing a specific toolchain, the Settings page became invalid and could not be opened; fixed, in order to fix the project configuration, now the settings page opens for projects having non-existing toolchains.

Other changes

none.

Known problems

[#108] in certain conditions, the Enable flash breakpoints button does not function properly; will be fixed in the next release.